Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income
Interest and fees on loans	$ 73,267	$ 61,521
Interest on taxable securities	5,207	4,800
Interest on nontaxable securities	322	416
Interest on deposits in other banks and federal funds sold	716	313
Total interest income	79,512	67,050
Interest expense
Interest on deposits	6,772	3,763
Interest on other borrowings	3,939	2,697
Total interest expense	10,711	6,460
Net interest income	68,801	60,590
Provision for loan losses	1,801	1,836
Net interest income after provision for loan losses	67,000	58,754
Noninterest income
Service charges on deposit accounts	10,228	10,563
Mortgage banking activity	11,900	11,215
Other service charges, commissions and fees	719	709
Gain on sale of securities	37	0
Other noninterest income	3,580	3,219
Total noninterest income	26,464	25,706
Noninterest expense
Salaries and employee benefits	32,089	27,794
Occupancy and equipment expense	6,198	5,877
Data processing and communications costs	7,135	6,572
Credit resolution-related expenses	549	933
Advertising and marketing expense	1,229	1,106
Amortization of intangible assets	934	1,036
Merger and conversion charges	835	402
Other noninterest expenses	10,129	9,373
Total noninterest expense	59,098	53,093
Income before income tax expense	34,366	31,367
Income tax expense	7,706	10,214
Net income	26,660	21,153
Other comprehensive income
Net unrealized holding losses arising during period on investment securities available for sale, net of tax benefit of $2,500 and $105	(9,403)	(194)
Reclassification adjustment for gains on investment securities included in earnings, net of tax of ($8) and $0	(29)	0
Unrealized gains on cash flow hedges arising during period, net of tax expense of $75 and $23	281	43
Other comprehensive income (loss)	(9,151)	(151)
Total comprehensive income	$ 17,509	$ 21,002
Basic earnings per common share (in dollars per share)	$ 0.70	$ 0.59
Diluted earnings per common share (in dollars per share)	0.70	0.59
Dividends declared per common share (in dollars per share)	$ 0.10	$ 0.10
Weighted average common shares outstanding (in thousands)
Basic (in shares)	37,967	35,664
Diluted (in shares)	38,250	36,040